The Greater Sulfur Crested Cockatoo is probably the best known of all Cockatoos. It is also the largest. It is white colored with the tail feathers and underside of the wings being yellow. The head is crowned by a bright sulfur-yellow crest, which curves upwards. These appear green because, according to the photographer: "I decided to go outside instead and shoot them even with the cage infront of me. Thank God to the Aperture Power. "